Nitrogen Tire Filling Field Data Analysis NY City Transit, Flatbush Depot - PowerPoint PPT Presentation

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Nitrogen Tire Filling Field Data Analysis NY City Transit, Flatbush Depot

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  1. Nitrogen Tire FillingFieldData AnalysisNY City Transit, Flatbush Depot

  2. NYC Transit Bus Fleet Base Data A trial was conducted by NYC Transit, NY Power Authority to evaluate the benefits of using Nitrogen in bus tires at NYCT’s Flatbush Avenue bus depot in Brooklyn, NY in December 2007. This rigorously collected data formed the basis for further conversion of other depots to nitrogen. Since then, 4 more depots have been converted to Nitrogen. Analysis done in this report is based only on field data collected in the trial.

  3. Air Filled Tires Nitrogen Filled Tires Tires Requiring Top-off in 30 days

  4. Air Filled Tires Nitrogen Filled Tires Number of Flat Tires Every Month

  5. Pressure Loss Data Air Filled Tires Nitrogen Filled Tires

  6. Impact of Under-InflationData from various Tire Companies Most Conservative estimates from Michelin are used for cost savings

  7. Air Filled Tires Nitrogen Filled Tires Fuel Consumption ImpactBased on Michelin Data

  8. Air Filled Tires Nitrogen Filled Tires Fuel Cost Impact

  9. Air Filled Tires Nitrogen Filled Tires Tire Life Impact

  10. Conclusions • Nitrogen tire filling showed clear & demonstrated benefits over air filled tires as listed below: • Tires retained correct pressure for longer time • Less tire top offs would result in lower labor cost • Lower number of flat tires (by ~3/month) would help reduce expensive downtime and tire cost • Tire rolling resistance was reduced • Lowered fuel consumption is projected to be $0.5 MM/year based on Michelin’s conservative basis • Tire friction and tire wear was reduced • Tire life improvement is extrapolated to be about 20% based on the most conservative data